Implemented burst sub-slot splitter. Issue #100
diff --git a/lib/flow_control/burst_sdcch_subslot_splitter_impl.cc b/lib/flow_control/burst_sdcch_subslot_splitter_impl.cc
new file mode 100644
index 0000000..260fe11
--- /dev/null
+++ b/lib/flow_control/burst_sdcch_subslot_splitter_impl.cc
@@ -0,0 +1,135 @@
+/* -*- c++ -*- */
+/* @file
+ * @author Roman Khassraf <rkhassraf@gmail.com>
+ * @section LICENSE
+ *
+ * Gr-gsm is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * Gr-gsm is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with gr-gsm; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include "burst_sdcch_subslot_splitter_impl.h"
+#include <stdio.h>
+#include <grgsm/endian.h>
+#include <grgsm/gsmtap.h>
+
+
+namespace gr {
+ namespace gsm {
+
+ burst_sdcch_subslot_splitter::sptr
+ burst_sdcch_subslot_splitter::make(splitter_mode mode)
+ {
+ return gnuradio::get_initial_sptr
+ (new burst_sdcch_subslot_splitter_impl(mode));
+ }
+
+ /*
+ * The private constructor
+ */
+ burst_sdcch_subslot_splitter_impl::burst_sdcch_subslot_splitter_impl(splitter_mode mode)
+ : gr::block("burst_sdcch_subslot_splitter",
+ gr::io_signature::make(0, 0, 0),
+ gr::io_signature::make(0, 0, 0)),
+ d_mode(mode)
+ {
+ message_port_register_in(pmt::mp("in"));
+
+ message_port_register_out(pmt::mp("out0"));
+ message_port_register_out(pmt::mp("out1"));
+ message_port_register_out(pmt::mp("out2"));
+ message_port_register_out(pmt::mp("out3"));
+ if (d_mode == SPLITTER_SDCCH8)
+ {
+ message_port_register_out(pmt::mp("out4"));
+ message_port_register_out(pmt::mp("out5"));
+ message_port_register_out(pmt::mp("out6"));
+ message_port_register_out(pmt::mp("out7"));
+ }
+
+ set_msg_handler(pmt::mp("in"), boost::bind(&burst_sdcch_subslot_splitter_impl::process_burst, this, _1));
+ }
+
+ /*
+ * Our virtual destructor.
+ */
+ burst_sdcch_subslot_splitter_impl::~burst_sdcch_subslot_splitter_impl() {}
+
+ void burst_sdcch_subslot_splitter_impl::process_burst(pmt::pmt_t msg)
+ {
+ pmt::pmt_t header_plus_burst = pmt::cdr(msg);
+ gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_plus_burst);
+
+ uint32_t frame_nr = be32toh(header->frame_number);
+ uint32_t fn_mod102 = frame_nr % 102;
+
+ int8_t subslot;
+
+ if (d_mode == SPLITTER_SDCCH8)
+ {
+ subslot = d_subslots_sdcch8[fn_mod102];
+ }
+ else if (d_mode == SPLITTER_SDCCH4)
+ {
+ subslot = d_subslots_sdcch4[fn_mod102];
+ }
+
+ if ((subslot == -1) || (d_mode == SPLITTER_SDCCH4 && subslot > 3))
+ {
+ return;
+ }
+
+ std::string port("out");
+
+ switch (subslot)
+ {
+ case 0:
+ port.append("0");
+ break;
+ case 1:
+ port.append("1");
+ break;
+ case 2:
+ port.append("2");
+ break;
+ case 3:
+ port.append("3");
+ break;
+ case 4:
+ port.append("4");
+ break;
+ case 5:
+ port.append("5");
+ break;
+ case 6:
+ port.append("6");
+ break;
+ case 7:
+ port.append("7");
+ break;
+ default:
+ port.append("0");
+ break;
+ }
+
+ message_port_pub(pmt::mp(port), msg);
+ }
+ } /* namespace gsm */
+} /* namespace gr */